<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
    <link rel="stylesheet" href="css/de.css"/>
    <script type="text/javascript" src="js/jquery-1.11.0.js"></script>


</head>
<body>
<body>
<div class="mainbody middle">
    <form class="form-box front">
        <div>
            <h1>网盘登陆 </h1>
        </div>
        <div>
            <input class="input-normal" type="text" placeholder="UserAccount" />
            <input class="input-normal" type="password" placeholder="PassWord" />
            <button class="btn-submit" type="submit">
                <a href="http://www.baidu.com/"> 登陆</a>
            </button>
            <style>
                a{ text-decoration:none}
            </style>
        </div>
        <div>
            <p style="margin-top: 40px">If you don't have account.Please</p>
            <p>Click here to <a id="signup">注册</a></p>
            <script type="text/javascript">

                // 点击sigup触发翻转样式
                $("#signup").click(function() {
                    $(".middle").toggleClass("middle-flip");
                });


            </script>

        </div>
    </form>
    <!-- 对的你没看错，上下两个表单基本上没区别，一个front，一个back -->
    <form class="form-box back">
        <div>
            <h1>网盘注册</h1>
        </div>
        <div>
            <input class="input-normal" type="text" placeholder="UserAccount" />
            <input class="input-normal" type="password" placeholder="PassWord" />
            <button class="btn-submit" type="submit">
                注册
            </button>
        </div>
        <div>
            <p style="margin-top: 40px">Have a account ? You can</p>
            <p>Click here to <a id="login">登陆</a></p>
            <script type="text/javascript">

                // 点击login触发翻转样式
                $("#login").click(function() {
                    $(".middle").toggleClass("middle-flip");
                });

            </script>

        </div>
    </form>
</div>
</body>
</body>

</html>
</body>
</html>